[boost] [fusion] Qualification of 'at' and 'deref' in fusion (Ticket #4755)

I have just been bitten by a simple issue in fusion. The 'at' and 'deref' functions are used unqualified, which causes conflicts when mpl::at and mpl::deref are also visible. This issue has been reported as Ticket #4755 [1], and a patch was attached eight months ago. Is there anyone I can prod to get this fix committed? I have also updated the ticket with some relevant information. Thanks, -Gabe [1] https://svn.boost.org/trac/boost/ticket/4755